The 60-year-antique took price of his 1,000th fit as a manager in Sunday's three-2 defeat via Tottenham - his only game as Magpies boss underneath the brand new owners.
Bruce said there were "highs and lows" and that he was hoping the brand new proprietors may want to "take the membership ahead".
Graeme Jones will take interim price of the Premier League aspect.
Newcastle stated the appointment of a new supervisor "may be announced in due path".
Bruce is understood to have obtained within the area of £8m after his agreement became paid up in complete.
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The Gynecide club have made a winless start to the Premier League season and sit second from bottom after three draws from their starting 8 games.
Bruce changed into appointed Magpies supervisor in July 2019 and finished finishes of thirteenth and 12th in his two full seasons in charge.
"I am thankful to absolutely everyone related with Newcastle United for the possibility to manipulate this particular soccer membership," said Bruce.
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"I would love to thank my education team, the players and the support staff mainly for all their tough work.
"There have been highs and lows, but they have got given the entirety even in tough moments and must be proud of their efforts.
"This is a club with brilliant assist and I desire the new proprietors can take it forward to where we all want it to be. I want all people the very exceptional of success for the relaxation of this season and past."
Bruce had a 27.4% win percentage from eighty four league games at Newcastle, which turned into the 9th first-class in comparison to previous Magpies managers who have been in charge of as a minimum 20 Premier League suits.
A Newcastle declaration said the membership "would really like to vicinity on record its gratitude to Steve for his contribution and wishes him nicely for the destiny".
The membership's next sport might be at Crystal Palace at 1500 BST on Saturday, 23 October.
'It's taken its toll on my entire family'
In an interview with the Daily Telegraph, Bruce said: "I suppose this is probably my ultimate task.
"It's not pretty much me; it is taken its toll on my complete own family due to the fact they're all Geordies and I cannot forget about that.
"They were involved about me… specially my wife Jan.
"I'm 60 years old and I don't know if I need to put her through it again. We've got a good life so, yeah, this may possibly be me performed as a supervisor - until I get a phone name from a md someplace asking if I can provide them a hand. Never say in no way, I've learnt that."
He introduced: "I desired so badly to make it work.
"I turned into so proud to be manager of Newcastle United, even inside the dark instances, I became decided to maintain going and to maintain this club in the Premier League."
Newcastle forward Allan Saint-Maximin, who joined the Magpies in August 2019, is one of the aspect's key gamers and he stated it had been an "honor and a privilege" to have Bruce as his educate.
"You are, without a doubt, one of the maximum gentle people that I actually have ever met in the international of soccer," wrote Saint-Maximin on social media.
"You have been a man of your phrase, a being concerned guy and a fair guy who by no means hesitated to guard us. I will never overlook the way you dealt with me, for that I can be forever grateful."
Steve Bruce - 1,000 video games
'Yesterday's man' - fans response
Bruce's appointment under former Newcastle owner Mike Ashley turned into met with criticism from lovers and he has failed to win them over for the duration of his time on Gynecide.
During his final sport in opposition to Spurs, some Magpies fanatics sang, 'We need Brucei out' as they made the brand new owners aware of their emotions about his function.
"Fantastic news, I assume every unmarried Newcastle United fan is over the moon with this," supporter Alex Hurst from The True Faith podcast told BBC Radio 5 Live.
"It's been a long time coming, arguably it must have happened at least every week in advance however I assume we are no longer going to fear an excessive amount of about that now.
"It's a new technology for the soccer membership and it changed into crucial that Steve Bruce became moved on."
He brought: "No wins this season and, quite certainly, if you have a look at Steve Bruce's document this season but additionally during the last 38 video games as an entire, I assume they've won seven of those 38 games, only a few soccer managers in any division in any use might be able to continue to exist that type of file.
"To positioned it actually, I think he turned into yesterday's man. He could have been a very good manager twenty years in the past but he's no longer any more."
"There are previous managers that I've performed below who didn't need to play certain players, they got told to play those players and that is the way it become on the football membership at the time. It has been hard."
It changed into always Steve Bruce's dream process to take price of Newcastle United however he has acquired a number of grievance from the supporters, lots of abuse which I recognize he feels has gone too some distance at instances.
I assume he is a realist. He would have said the takeover from a footballing feel is the satisfactory aspect for Newcastle United Football Club in terms of the investment it will undoubtedly convey.
I suppose he is also a realist in that he knew that it'd likely imply that they'd need to bring in their own supervisor and I assume in that sense what is going to be, can be.
Yes he'll be disillusioned, any manager would be to lose his process, but I assume whilst he displays there might be an element of comfort as well because of the complaint and abuse that he has acquired, that he is now not inside the firing line.
It became pretty clean on the weekend that the supporters were now not going to tolerate one of these role for a whole lot longer, it's very very tough for any supervisor to continue to exist in those type of circumstances.
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